Job 41:4

Will he make a covenant with thee? - That is, will he submit himself to thee, and enter into a compact to serve thee? Such a compact was made by those who agreed to serve another; and the idea here is, that the animal here referred to could not be reduced to such service - that is, could not be tamed.

Wilt thou take him for a servant for ever? - Canst thou so subdue him that he will be a perpetual slave? The meaning of all this is, that he was an untamable animal, and could not be reduced, as many others could, to domestic use.